nokogiri/diff issue

first.xml

<root>
	<leaf1>
		<subleaf id="test"></subleaf>
	</leaf1>
	<leaf2>
		<subleaf got="game">text</subleaf>
		<subleaf id="hello">inside</subleaf>
	</leaf2>
</root>

second.xml

<root>
	<leaf2>
		<subleaf id="hello">inside</subleaf>
		<subleaf got="game">text</subleaf>
	</leaf2>
	<leaf1>
		<subleaf id="test"></subleaf>
	</leaf1>
</root>

test_runner.rb

require 'nokogiri'
require 'nokogiri/diff'

xml_doc1 = File.open("first.xml") { |f| Nokogiri::XML(f) }
xml_doc2 = File.open("second.xml") { |f| Nokogiri::XML(f) }

xml_doc1.diff(xml_doc2, { added: 'true' }) do |change, node|
  p "#{change} #{node}"
end